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Novel in-situ passivation modifier and preparing method thereof

An improvement agent and in-situ technology, applied in chemical instruments and methods, organic fertilizers, fertilizer mixtures, etc., can solve the problems of reducing the bioavailability of heavy metals, achieve the effect of controlling heavy metal pollution, reducing absorption and accumulation

Inactive Publication Date: 2014-12-10
QINGDAO HUAREN TECH INCUBATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, iron can interact with arsenic and manganese to form a stable bidentate structure complex, thereby reducing the bioavailability of heavy metals

Method used

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  • Novel in-situ passivation modifier and preparing method thereof
  • Novel in-situ passivation modifier and preparing method thereof
  • Novel in-situ passivation modifier and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation of embodiment 1 in-situ passivation agent 1

[0040] The in-situ passivator 1 is obtained by uniformly mixing nano-iron powder with a particle size of 80nm, fly ash, zeolite, and calcium magnesium phosphate fertilizer in a weight ratio of 15:35:40:10.

[0041] Proof of effect

[0042] Apply the in-situ passivation agent prepared in Example 1 with a thickness of 1 cm on the surface of the heavy metal-contaminated soil, and then cover the surface layer of the heavy metal-contaminated soil remediation agent with 20 cm thick uniformly mixed non-polluting soil.

[0043]Restoration: After 15 days, the heavy metals cadmium, lead, arsenic, and chromium in heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, and the in-situ restoration of heavy metal-contaminated soil was realized. The requirements of GB2762-2005 "Limits of Contaminants in Food".

[0044] The results are shown in Table 1.

[0045]...

Embodiment 2

[0047] The preparation of embodiment 2 in-situ passivation agent 2

[0048] The in-situ passivator 2 is obtained by uniformly mixing nano-iron powder with a particle size of 120nm, fly ash, zeolite, and calcium magnesium phosphate fertilizer in a weight ratio of 20:40:35:5.

[0049] Proof of effect

[0050] Apply the in-situ passivator 2 prepared in Example 2 with a thickness of 0.5 cm on the surface of the heavy metal-contaminated soil, and then cover the surface of the heavy metal-contaminated soil remediation agent with 20 cm thick uniformly mixed non-polluting soil.

[0051] Restoration: After 1 month, the heavy metals cadmium, lead, arsenic, and chromium in the heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, and the in-situ restoration of the heavy metal-contaminated soil was realized. National "Contaminant Limits in Food" GB2762-2005 requirements.

[0052] The results are shown in Table 2.

[0053] T...

Embodiment 3

[0055] The preparation of embodiment 3 in-situ passivation agent 3

[0056] The in-situ passivator 3 is obtained by uniformly mixing nano-iron powder with a particle size of 90nm, fly ash, zeolite, and calcium magnesium phosphate fertilizer in a weight ratio of 20:30:40:10.

[0057] Proof of effect

[0058] Apply the in-situ passivator 3 prepared in Example 3 with a thickness of 0.5 cm on the surface of the heavy metal-contaminated soil, and then cover the surface of the heavy metal-contaminated soil remediation agent with 20 cm thick uniformly mixed non-polluting soil.

[0059] Restoration: After 1 month, the heavy metals cadmium, lead, arsenic, and chromium in the heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, and the in-situ restoration of the heavy metal-contaminated soil was realized. National "Contaminant Limits in Food" GB2762-2005 requirements.

[0060] The results are shown in Table 3.

[0061] t...

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Abstract

The invention provides a novel in-situ passivation modifier for heavy metal polluted farmland soil. The in-situ passivation modifier comprises nanometer iron powder, coal ash, zeolite and a calcium magnesium phosphate fertilizer. A material obtained by mixing the nanometer iron powder, the coal ash, the zeolite and the calcium magnesium phosphate fertilizer according to a ratio which are simple in source and low in cost is adopted by the in-situ passivation modifier and is subjected to chemical reactions (precipitation, adsorption, complexing, oxidation-reduction, and the like) with heavy metals in the soil to form stable compounds so as to reduce bio-availability of the heavy metals in the soil, thus reducing absorption and accumulation of the heavy metals by plant root and achieving an objective of treating farmland soil heavy metal pollution.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal treatment, in particular to a novel in-situ passivation modifier for farmland soil polluted by heavy metals and a preparation method thereof. Background technique [0002] In recent years, with the massive development and utilization of mineral resources, the rapid development of industrial production and the widespread use of various chemical products, pesticides and fertilizers, the problem of soil environmental safety in my country has become increasingly prominent. Heavy metals are difficult to degrade, easy to accumulate, and highly toxic, which have an impact on the growth, yield and quality of crops. In particular, they can be absorbed by crops and enter the human body through the food chain, posing a serious threat to human health. At present, nearly 20 million hectares of arable land are polluted by heavy metals such as lead, arsenic, chromium, and cadmium, accounting for about 2...

Claims

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Application Information

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IPC IPC(8): C09K17/08C09K101/00
Inventor 不公告发明人
Owner QINGDAO HUAREN TECH INCUBATOR
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